CN103885646B - Optical touch device and operating method thereof - Google Patents

Abstract

The invention discloses an optical touch device and an operation method thereof. The operation method of the optical touch device comprises the following steps: emitting a light source with the light emitting unit to illuminate an object; acquiring an image of the object reflecting the light source by using the image sensing device; selecting all pixels of which the brightness is greater than or equal to a brightness critical value in the image; sorting the selected pixels according to a first coordinate axis of the image, a second coordinate axis of the image or pixel brightness; selecting pixels with the preset proportion from the sorted pixels as the object image of the object; and calculating the gravity center of the object image according to the pixel position or the collocation of the pixels with the preset proportion in a mode of taking the pixel brightness as weight. The invention also discloses an optical touch device. The gravity center judgment result obtained by the optical touch device and the operation method thereof provided by the invention can not cause the back-end circuit to execute wrong operation.

Description

Optical touch device and operating method thereof

technical field

The present invention relates to the technical field of optical touch, and in particular to an optical touch device and an operation method thereof.

Background technique

Existing optical touch devices use a light emitting device to emit a light source to irradiate the user's hand, and use an image sensing device to obtain an image of the hand reflecting the light source, and then calculate the hand image in the obtained image (that is, the image of the palm part) of the center of gravity. In this way, the back-end circuit can perform corresponding operations according to the center of gravity calculated by the optical touch device, such as controlling the displacement of a cursor on the screen.

However, this optical touch device has a disadvantage, that is, when the user's hand and arm enter the image captured by the image sensing device, the optical touch device will calculate the two images of the hand image and the arm image. Or the common center of gravity, causing the back-end circuit to perform wrong operations, such as moving the cursor on the screen to the wrong position.

Therefore, it is necessary to provide an improved technical solution to overcome the above technical problems in the prior art.

Contents of the invention

The main technical problem to be solved by the present invention is to provide an optical touch device, which only calculates the center of gravity of the required object image, and thus does not cause the problems of the prior art.

In order to solve the above-mentioned technical problems, the present invention provides the following detailed description with reference to the accompanying drawings, and other aspects and features of the present invention will become apparent. It should be understood, however, that the drawings are designed for purposes of illustration only and not as a limitation of the scope of the invention, since reference should be made to the appended claims. It should also be understood that, unless otherwise indicated, the drawings are not necessarily drawn to scale and are merely intended to conceptually illustrate the structures and processes described herein.

The present invention provides an optical touch device, which only calculates the center of gravity of the required object image, and thus does not cause the problems of the prior art.

The present invention further provides an operation method corresponding to the above-mentioned optical touch device.

The present invention provides an optical touch device, which includes a light emitting unit, an image sensing device and a processing circuit. The light emitting unit is used to emit light to illuminate the object. The image sensing device is used to acquire the image of the object reflecting the light source. As for the processing circuit, it is electrically connected to the above-mentioned image sensing device to obtain the above-mentioned image, and is used to select all the pixels in the above-mentioned image whose brightness is greater than or equal to the brightness threshold value, so as to select the pixels according to the first image of the above-mentioned image. The first axis, the second axis of the image above, or the pixel brightness are sorted. The processing circuit is also used to take the pixels of the predetermined ratio in front of the sorted pixels as the object image of the above object, and according to the pixel positions of the pixels of the predetermined ratio, or the pixels of the pixels of the predetermined ratio The position and the weight of the pixel brightness are used to calculate the center of gravity of the above-mentioned object image.

The invention further provides an operation method of the optical touch device. The optical touch device includes a light emitting unit and an image sensing device. The operation method includes the following steps: using the above-mentioned light-emitting unit to emit a light source to illuminate the object; using the above-mentioned image sensing device to obtain an image of the above-mentioned object reflecting the above-mentioned light source; selecting all pixels in the above-mentioned image whose brightness is greater than or equal to a brightness threshold; Sorting the selected pixels according to the first coordinate axis of the above image, the second coordinate axis of the above image, or the brightness of the pixels; taking the pixels of the previous predetermined proportion from the sorted pixels as the object image of the above object; and The center of gravity of the object image is calculated according to the pixel positions of the predetermined proportion of pixels, or according to the pixel positions of the predetermined proportion of pixels with pixel brightness as a weight.

The method of the present invention to solve the aforementioned problems is to first emit a light source to illuminate the object; then, use the above-mentioned image sensing device to obtain the image of the above-mentioned object reflecting the above-mentioned light source; and then select all pixels in the above-mentioned image whose brightness is greater than or equal to the brightness threshold ; Next, sort the selected pixels according to the first coordinate axis of the above-mentioned image, the second coordinate axis of the above-mentioned image, or the brightness of the pixels; The object image of the object; finally, the center of gravity of the object image is calculated according to the pixel positions of the above predetermined proportion of pixels, or according to the pixel positions of the above predetermined proportion of pixels and taking the pixel brightness as a weight. From the above, it can be seen that the present invention only calculates the center of gravity of the required object image, and thus does not cause the problems of the prior art.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic side sectional view of an electronic device.

FIG. 2 is a schematic diagram of one of the images captured by the image sensing device in FIG. 1 .

FIG. 3 shows the pixels selected by the processing circuit in one of the steps.

FIG. 4 shows the pixels selected by the processing circuit in one of the steps.

FIG. 5 is a schematic diagram of an image and a screen captured by the image sensing device.

FIG. 6 is a flowchart of an operating method of an optical touch device according to an embodiment of the invention.

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be noted that, for the sake of clarity of illustration, the drawings of the present invention only show structural features related to the inventive point of the present invention, while other structural features are omitted.

FIG. 1 is a schematic side sectional view of an electronic device. The reference numeral 100 in FIG. 1 refers to the electronic device, and the electronic device 100 is, for example, a portable electronic device such as a smart phone, a tablet computer, a notebook computer, or other electronic devices with computing functions. For example, a multimedia playback device. As shown in FIG. 1 , the electronic device 100 adopts an optical touch device 110 according to an embodiment of the present invention, and the optical touch device 110 is electrically connected to the processor 120 inside the electronic device 100 (which can be viewed visually. is the back-end circuit of the optical touch device 110).

The optical touch device 110 includes a light emitting unit 112 , an image sensing device 114 and a processing circuit 116 . The light emitting unit 112 is used for emitting a light source to irradiate the user's hand (shown by reference numeral 130 ). The image sensing device 114 is used to acquire the image reflected by the light source from the hand 130 . As for the processing circuit 116 , it is electrically connected to the image sensing device 114 to obtain an image captured by the image sensing device 114 . Further, the processing circuit 116 can also be electrically connected to the light emitting unit 112 to control the light emitting unit 112 to be turned on or off, and even to control the brightness of the light source.

The image shown in FIG. 2 will be used as an example to illustrate the operation of the processing circuit 116 below. Please refer to FIG. 2 , which is a schematic diagram of one of the images captured by the image sensing device 114 of FIG. 1 . The image is composed of multiple pixels, for example, 800×600 pixels. For the convenience of illustration, the image shown in Figure 2 is represented by only four different brightnesses, including: the brightest (such as an area without any patterns), the second brightest (such as an area formed by dots), and the second darkest. (as areas formed by diagonal lines) and the darkest (as areas formed by cross lines). The brightest area has a first brightness value, the next brightest area has a second brightness value, the next darkest area has a third brightness value, and the darkest area has a fourth brightness value. In addition, reference numeral 202 in FIG. 2 refers to a hand image and an arm image. In FIG. 2 , the reason why the hand image and the arm image 202 present three different brightnesses is that the distances between the hand parts and arm parts corresponding to the three different brightness levels and the light emitting unit 112 are different; The reason why the areas outside the hand image and the arm image 202 have the darkest brightness is that there is no object in the corresponding space to reflect the light source.

Please refer to Figure 1 and Figure 2 at the same time. After the processing circuit 116 acquires the image shown in FIG. 2 through the image sensing device 114 , it will select all the pixels in the image whose brightness is greater than or equal to the brightness threshold. The brightness threshold can be determined according to actual design requirements. Assuming that the brightness critical value is between the first brightness value and the second brightness value, then the pixel selected by the processing circuit 116 in this step will be the brightest region (that is, the region without any patterns) ) in all pixels. FIG. 3 is the pixels selected by the processing circuit 116 in this step. In Fig. 3, the image shown is displayed with a Cartesian coordinate system, and the pixel in the upper left corner of this image is located at the origin of the Cartesian coordinate system (labeled by P), however the image shown in this figure is not compatible with the Cartesian coordinate system The positional relationship is for example only, and is not intended to limit the present invention.

Please refer to FIG. 1 and FIG. 3 at the same time. After the processing circuit 116 obtains all the pixels in the brightest region (such as the region without any pattern in FIG. 3 ), the processing circuit 116 will select the selected pixels according to The X-axis of the image, the Y-axis of the image, or the brightness of the pixels are sorted. In terms of sorting according to the Y axis, the processing circuit 116 may sort the selected pixels from top to bottom and from left to right, for example. Of course, the sorting method needs to be set in advance according to the possible imaging methods. Taking the image shown in FIG. 4 as an example, after the processing circuit 116 selects all the pixels in the brightest region (such as the region without any pattern in FIG. , from top to bottom) to sort the selected pixels. Taking the example shown in FIG. 3 as an example, it is an ideal choice to sort according to the Y axis, and to sort from top to bottom.

Please refer to FIG. 1 and FIG. 3 at the same time. Assuming that the processing circuit 116 has sorted the selected pixels from top to bottom and from left to right as described above, the processing circuit 116 will sort the selected pixels from the sorted pixels. Then take the pixels of the predetermined ratio in front as the required object image. Taking Fig. 3 as an example, the sorted pixels are all located between Y" and the origin P, and the pixels of the predetermined proportion are located between Y' and the origin P. In this way, the processing circuit 116 will only obtain Finger image, and the finger image can be regarded as its required object image, while other parts of the hand image, arm image and other irrelevant images are filtered out. The predetermined ratio can be determined according to actual design requirements Determine, for example, the processing circuit 116 can be to get the front 20% pixels from the pixels sorted out. And after obtaining the required object image, the processing circuit 116 will be based on the pixel position of the pixel in the object image, or Calculate the center of gravity of the object image according to the pixel position of the pixel in the object image and take the pixel brightness as a weight. For this example, the processing circuit 116 is used to calculate the center of gravity of the obtained finger image, and is based on the weight of the finger image The pixel position of the pixel is used to calculate the center of gravity of the finger image. However, in other implementations, the processing circuit 116 can also calculate the center of gravity of the finger image with the pixel position of the pixel in the finger image and with the pixel brightness as a weight. It should be noted The most important thing is that the center of gravity calculated in this way is the average center of gravity. The calculation formula for calculating the required image center of gravity with the pixel brightness as the weight is listed below:

${\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, X _A is the X coordinate of the average center of gravity, Y _A is the Y coordinate of the average center of gravity, X ₁ ~ X _N are the X coordinates of the pixel positions of the pixels in the obtained target image, and L ₁ ~ L _N are the obtained The pixel luminance of the pixel in the target image, Y ₁ to Y _N are the Y coordinates of the pixel positions of the pixels in the obtained target image, respectively. In addition, N is a natural number, which represents the total number of pixels in the acquired target image.

After calculating the center of gravity of the desired object image, the processing circuit 116 can correspondingly output the center of gravity information GS as the center of gravity judgment result, so that the processor 120 inside the electronic device 100 can control the electronic device 100 to execute the corresponding center of gravity according to the center of gravity judgment result. operation. Assuming that the electronic device 100 has a screen (not shown), the processor 120 can control the displacement of the cursor on the screen according to the determination result of the center of gravity.

From the above description, it can be seen that when the user's hand and arm both enter the image captured by the image sensing device 114, the optical touch device 110 does not calculate the common center of gravity of the hand image and the arm image. , but will only calculate the center of gravity of the required object image, so the obtained center of gravity judgment result will not cause the back-end circuit to perform wrong operations, such as moving the cursor on the screen to a wrong position.

Please refer to FIG. 1 again, assuming that the electronic device 100 has a screen (not shown), and the resolution of the screen is different from the resolution of the image captured by the image sensing device 114, then the processing circuit 116 can also be based on its The calculated relative position of the center of gravity in the image captured by the image sensing device 114 is used to convert the relative position of the cursor on the screen, so that the processor 120 can control the movement of the cursor according to the converted result of the processing circuit 116 .

Of course, the processing circuit 116 can also convert the moving vector of the cursor according to the result of multiplying the calculated moving vector of the center of gravity by another preset ratio, so that the processor 120 can control the cursor according to the conversion result of the processing circuit 116. The movement of the cursor. In this way, the effect of making the cursor move faster than the user's hand can be achieved. The other predetermined ratio can be determined according to actual design requirements. In addition, the processing circuit 116 may also further convert the calculated weight according to the result of multiplying the calculated position of the center of gravity relative to the center position of the image captured by the image sensing device 114 by another preset ratio. The moving vector of the cursor, so that the processor 120 can control the moving of the cursor according to the conversion result of the processing circuit 116 . In this way, the effect that the cursor can still move continuously can be achieved even if the user's hand does not move continuously. The still another predetermined ratio can also be determined according to actual design requirements. In addition, it is worth mentioning that the processing circuit 116 may further include a low-pass filter 116-2, so as to use the low-pass filter 116-2 to smooth the movement of the cursor on the screen.

In addition, in order to solve the problem that the cursor cannot move to the edge of the screen, the processing circuit 116 may also calculate the center of gravity based on the relative position of the default area in the image captured by the image sensing device 114. The conversion of the relative position of the cursor on the screen is illustrated in FIG. 5 . FIG. 5 is a schematic diagram of the image captured by the image sensing device 114 and the screen. In FIG. 5 , reference numeral 510 represents the image captured by the image sensing device 114 , reference numeral 512 represents the default area, reference numeral 516 represents the object image required by the processing circuit 116 , and reference numeral 520 represents the screen. In this example, the shape of the default area 512 is a parallelogram, and the center point of the default area 512 is located at the center point of the image 510 (shown by reference numeral 514 ), but this is not intended to limit the present invention. In addition, for the convenience of description, it will be assumed that the center of gravity of the object image 516 is located at the edge of the default area 512 .

Please refer to FIG. 5, when the object image 516 is located at the edge of the image 510 acquired by the image sensing device 114, since the object image 516 itself needs to have a certain size (because the size is too small, it will be filtered out by the processing circuit 116 as noise). In addition), if the processing circuit 116 calculates the center of gravity of the object image 516, it converts the position of the cursor on the screen 520 according to the relative position of the calculated center of gravity in the image 510 acquired by the image sensing device 114 When the relative position of , then the cursor will still have a considerable distance from the edge of the screen 520 . However, if the processing circuit 116 uses the calculated relative position of the center of gravity in the default area 512 to convert the relative position of the cursor on the screen 520 after calculating the center of gravity of the object image 516, then The cursor can then be located at the edge of the screen 520 .

According to the above teachings, those skilled in the art can summarize some basic operation steps of the aforementioned optical touch device, as shown in FIG. 6 . FIG. 6 is a flowchart of an operating method of an optical touch device according to an embodiment of the invention. The optical touch device includes a light-emitting unit and an image sensing device, and the operation method includes the following steps: using the light-emitting unit to emit a light source to illuminate an object (as shown in label S602); using the The image sensing device acquires the image of the object reflecting the light source (as shown in label S604); selects all pixels in the image whose brightness is greater than or equal to the brightness threshold (as shown in label S606); Sorting according to the first coordinate axis of the image, the second coordinate axis of the image, or pixel brightness (as shown in label S608); from the sorted pixels, take the pixels of the previous predetermined proportion as the object and calculate the center of gravity of the object image according to the pixel positions of the predetermined proportion of pixels, or according to the pixel positions of the predetermined proportion of pixels and taking the pixel brightness as a weight (such as shown in label S612).

To sum up, the method of the present invention to solve the foregoing problems is to first emit a light source to irradiate the object; then, use the above-mentioned image sensing device to obtain the image of the above-mentioned object reflecting the above-mentioned light source; All the pixels of the critical value; then, sort the selected pixels according to the first coordinate axis of the above-mentioned image, the second coordinate axis of the above-mentioned image, or the pixel brightness; then, from the sorted pixels, take the previous predetermined proportion Finally, the center of gravity of the object image is calculated according to the pixel position of the above-mentioned predetermined proportion of pixels, or according to the pixel position of the above-mentioned predetermined proportion of pixels with pixel brightness as a weight. From the above, it can be seen that the present invention only calculates the center of gravity of the required object image, and thus does not cause the problems of the prior art.

In this paper, specific examples are used to illustrate the principle and implementation of the optical touch device and its operation method of the present invention. The description of the above implementation is only used to help understand the method of the present invention and its core idea; at the same time, for Those of ordinary skill in the art, according to the idea of the present invention, will have changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the present invention, and the protection scope of the present invention The appended claims shall prevail.

Claims (20)

1. an optical touch-control device, it is characterised in that including:

Luminescence unit, is used for sending light source with irradiation object；

Image sensor apparatus, for obtaining the image of light source described in described object reflection；And

Process circuit, be electrically connected with described Image sensor apparatus, to obtain described image, and be used for choosing In described image, brightness is more than or equal to all pixels of brightness critical values, with to selected pixel according to institute State the first coordinate axes of image, the second coordinate axes of described image or pixel intensity to be ranked up, described place Reason circuit is additionally operable to take the pixel of above the first predetermined ratio from the pixel sorted out again to be come as described The object image of object, and the location of pixels of the pixel according to described first predetermined ratio, or according to described The location of pixels of the pixel of the first predetermined ratio also calculates described object image with pixel intensity for weight Center of gravity.

2. optical touch-control device as claimed in claim 1, it is characterised in that described process circuit also depends on Convert the relative position that light is marked on screen according to the described center of gravity relative position in described image.

3. optical touch-control device as claimed in claim 2, it is characterised in that described process circuit also wraps Having included low pass filter, described low pass filter is for smoothing the movement on the screen of described cursor.

4. optical touch-control device as claimed in claim 2, it is characterised in that described process circuit also depends on According to the motion-vector of described center of gravity be multiplied by the result of the second preset ratio to the described smooth target that converts move to Amount.

5. optical touch-control device as claimed in claim 2, it is characterised in that described process circuit also depends on It is multiplied by second according to described center of gravity present position relative to the position vector of the center of described image and presets ratio The result of example converts described smooth target motion-vector.

6. optical touch-control device as claimed in claim 1, it is characterised in that described process circuit also depends on According to the relative position of described center of gravity default zone in described image convert that light is marked on screen relative Position.

7. optical touch-control device as claimed in claim 6, it is characterised in that the shape of described default zone Shape is parallelogram, and the central point of described default zone is positioned at the central point of described image.

8. optical touch-control device as claimed in claim 6, it is characterised in that described process circuit also wraps Having included low pass filter, described low pass filter is for smoothing the movement on the screen of described cursor.

9. optical touch-control device as claimed in claim 6, it is characterised in that described process circuit also depends on According to the motion-vector of described center of gravity be multiplied by the result of the second preset ratio to the described smooth target that converts move to Amount.

10. optical touch-control device as claimed in claim 6, it is characterised in that described process circuit is also It is multiplied by second according to described center of gravity present position relative to the position vector of the center of described image to preset The result of ratio converts described smooth target motion-vector.

The operational approach of 11. 1 kinds of optical touch-control devices, described optical touch-control device includes luminous single Unit and Image sensor apparatus, it is characterised in that described operational approach includes:

Described luminescence unit is utilized to send light source with irradiation object；

Described Image sensor apparatus is utilized to obtain the image of light source described in described object reflection；

Choose brightness in described image and be more than or equal to all pixels of brightness critical values；

Selected pixel is depended on the first coordinate axes of described image. the second coordinate axes of described image or pixel Brightness is ranked up；

Take from sequence pixel out that the pixel of above the first predetermined ratio comes as described object again is right As image；And

The location of pixels of the pixel according to described first predetermined ratio, or according to described first predetermined ratio The location of pixels of pixel also calculates the center of gravity of described object image with pixel intensity for weight.

12. operational approach as claimed in claim 11, it is characterised in that described operational approach also includes depending on Convert the relative position that light is marked on screen according to the described center of gravity relative position in described image.

13. operational approach as claimed in claim 12, it is characterised in that described operational approach also include with Low pass filter smooths the movement on the screen of described cursor.

14. operational approach as claimed in claim 12, it is characterised in that described operational approach also includes depending on According to the motion-vector of described center of gravity be multiplied by the result of the second preset ratio to the described smooth target that converts move to Amount.

15. operational approach as claimed in claim 12, it is characterised in that described operational approach also includes depending on It is multiplied by second according to described center of gravity present position relative to the position vector of the center of described image and presets ratio The result of example converts described smooth target motion-vector.

16. operational approach as claimed in claim 11, it is characterised in that described operational approach also includes depending on According to the relative position of described center of gravity default zone in described image convert that light is marked on screen relative Position.

17. operational approach as claimed in claim 16, it is characterised in that being shaped as of described default zone Parallelogram, and the central point of described default zone is positioned at the central point of described image.

18. operational approach as claimed in claim 16, it is characterised in that described operational approach also include with Low pass filter smooths the movement on the screen of described cursor.

19. operational approach as claimed in claim 16, it is characterised in that described operational approach also includes depending on According to the motion-vector of described center of gravity be multiplied by the result of the second preset ratio to the described smooth target that converts move to Amount.

20. operational approach as claimed in claim 16, it is characterised in that described operational approach also includes depending on It is multiplied by second according to described center of gravity present position relative to the position vector of the center of described image and presets ratio The result of example converts described smooth target motion-vector.